Gateway Fx Problems

A friend contacted me with a network problem the other day that
I thought I would share with you. Perhaps you have experienced as
well. And you know that the definition of the right to experiment?
Experience is what you get when you do not get what you wanted!

My friend and his wife had gone wireless. They bought new laptops
with built-in wireless (Wi-Fi) and wanted to start to wander around
Homeplace the power cable connection LAN while connected to the Internet.

Thus, in addition to laptops that came home with a Linksys wireless
router to provide the access point necessary for the laptops.
The guy at the computer store said it would work like a charm.
All they had to do was plug in the wireless router and go.
After rebooting, turn off and on, and call the computer store
all without success, they thought they had nothing to lose by calling me.
I have not figured if I'm flattered or insulted.

However, I was able to help, because I had experience (see definition above).

Let's start with a little background. As you probably know, to send and receive information
the Internet, your computer must have an Internet Protocol (IP).
This address IP is a part of Internet Transmission Control Protocol (TCP).
These addresses, which identify devices on the Internet,
are given in blocks to Internet Service Providers (ISPs)
the Internet Assigned Numbers Authority (IANA).
The ISP then redistributes these addresses to their customers. It is, in other words!
I have not heard of any provider that gives multiple IP addresses per account.
Normally, if you have a digital subscriber line (DSL) or cable Internet connection that you get
an IP address. And yet, the IP is often not permanently assigned to you.
The ISP will let you use it when you are online and then give to someone
another thing when you turn off (ie, out of your DSL or cable modem). This process
is called Dynamic Host Configuration Protocol (DHCP). Remember this DHCP.
She will appear later!

So how is that in their home that you were able to have more than one computer
with only one IP address?

Well two things come into play.
First, the IANA has reserved the
following three blocks of IP address space for private internets:

 10.0.0.0 - 10.255.255.255 (10 / 8 prefix)  172.16.0.0 - 172.31.255.255 (172.16/12 prefix)  192.168.0.0 - 192.168.255.255 (192.168/16 prefix) 

Secondly there is another protocol called Network Address Translation (NAT) involved.
The private IP address mentioned may be used freely and Internet system
should ignore all the addresses that err on the information superhighway.

But its local router meets these addresses. And if there is any package, as they are
sometimes called, with a private company (or internal) address IP went to the Internet,
your router will replace your own IP address, which acquired from the ISP
(this is the Network Address Translation).
When the router returns information will get it first and keep track of where
send it back to you through your private (or internal) IP address.
The router is able to do this even if you have multiple computers in your
private network (or internal).

Now, back to our problem. You may have noticed that your PC is a wire
NAT these private addresses, such as 192.168.1.100 when you turn it on. Routers
request an actual address of your ISP (often via DHCP). And then your
router can give you a private IP address, through its own DHCP server. When it gives
the IP address that tells you also to send their packages to the first. Becomes
your front door so he can translate the internal address Private IP to the real
Address. Thus, the Gateway IP address many (but not all routers) choose default is 192.168.1.1
and, especially, Routers Linksys.

But here's what happened to my friend. They already had a wired router (Netopia one) that
was to have an Internet address and using a real private internal IP address of the gateway
192.168.1.1 for the wired network computers. When the new Linksys wireless router
was connected to the Netopia, asked for an address IP via DHCP. It was given an IP address of 192.168.1.114
by Netopia. And then set the LinkSys as the gateway IP address 192.168.1.1 to the mobile
PCs connected. Now you may think this would work for two separate individuals
networks of fact. But as it turns out, the routers are very smart, but apparently no
smart. The Linksys wireless router received outgoing packets in the gateway IP address 192.168.1.1, but
got mixed up trying to pass them to the router Netopia also had a pass
IP address 192.168.1.1 that she was wearing.

The solution? Using the browser Linksys configuration utility based changed the gateway IP
address 192.168.2.1 to the Linksys.

Now I ignored some IP addressing issues, such as subnets and masks.
So if you're looking for more information or more details, try looking for
"IP Address", "private IP network," "NAT"
or "DHCP".

I hope my experience saves you from getting some experience!

Mike Furlong

Wireless networking equipment reviews and recommendataions at
ShoppingDroid.com

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